Heterogeneous Supersaturation in Mixed Perovskites

Chih-Shan Tan, Yi Hou, Makhsud I. Saidaminov, Andrew Proppe, Yu Sheng Huang, Yicheng Zhao, Mingyang Wei, Grant Walters, Ziyun Wang, Yongbiao Zhao, Petar Todorovic, Shana O. Kelley, Lih-Juann Chen, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

Thin-film solar cells based on hybrid lead halide perovskites have achieved certified power conversion efficiencies exceeding 24%, approaching those of crystalline silicon. This motivates deeper studies of the mechanisms that determine their performance. Twin defect sites have been proposed as a source of traps in perovskites, yet their origin and influence on photovoltaic performance remain unclear. It is found that twin defects—observed herein via both transmission electron microscopy and X-ray diffraction—are correlated with the amount of antisolvent added to the perovskite and that twin defects in the highest-performing perovskite photovoltaics are suppressed. Heterogeneous supersaturation nucleation is discussed as a contributor to efficient perovskite-based optoelectronic devices.
Original languageEnglish
Article number1903166
JournalAdvanced Science
Volume7
Issue number7
DOIs
StatePublished - Apr 2020

Keywords

  • defects
  • perovskites
  • traps
  • twins

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    Tan, C-S., Hou, Y., Saidaminov, M. I., Proppe, A., Huang, Y. S., Zhao, Y., Wei, M., Walters, G., Wang, Z., Zhao, Y., Todorovic, P., Kelley, S. O., Chen, L-J., & Sargent, E. H. (2020). Heterogeneous Supersaturation in Mixed Perovskites. Advanced Science, 7(7), [1903166]. https://doi.org/10.1002/advs.201903166